Minerals in India

Opencast Mining or quarrying by manual methods is adopted,
where large investment is not warranted,
where mechanization is likely to prove inefficient, either due to large size of pits or to the shape of the pits, and their location,
where mineralization is erratic and where selective … [Read more...] about Opencast Mining in India

North East Coal Fields in India: Workable coal fields seams occur in Assam and Meghalaya at three separate geological horizons, two of which belong to the Lower Eocene of Meghalaya and one in Oligocene of upper Assam. The rocks concerned belong to the Jaintia Formation in the first two regions and … [Read more...] about North East Coal Fields in India

Emerald in India
Emerald, the most valuable of all precious stones, is a transparent variety of beryl (3 BeO.Al2O3.6SiO2) with the well-known emerald-green colour. Other gemstone varieties of beryl are aquamarine, the sea-green and bluish stones; yellow beryl or heliodor, the yellow variety; … [Read more...] about Emerald Mines in India

The significant coal seams have been found in the rocks of the Damuda Group of Lower Gondwana age. Coal seams are found within the rocks of two formations, viz. the Lower or Barakar Coal Measures and the Upper or Raniganj Coal Measures. Geographically the rocks of the Barakar Formation are more … [Read more...] about Gondwana Coal